/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.beam.it.common.utils;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import org.slf4j.Logger;

/** IO Redirect Utility class. */
public final class IORedirectUtil {

  /**
   * Redirect an InputStream to a logger for testing and debugging purposes.
   *
   * @param inputStream The InputStream to redirect.
   * @param log The logger to redirect the InputStream to.
   */
  public static void redirectLinesLog(InputStream inputStream, Logger log) {
    new Thread(
            () -> {
              try (InputStreamReader isr =
                      new InputStreamReader(inputStream, StandardCharsets.UTF_8);
                  BufferedReader bis = new BufferedReader(isr)) {

                String line;
                while ((line = bis.readLine()) != null) {
                  log.info(line);
                }
              } catch (Exception e) {
                log.error("Error redirecting stream", e);
              }
            })
        .start();
  }
}
